When you say "Canned", you mean " Preserved in glass jars", right? There's always a confusion in my (English) mind because we eat baked beans out of (tin) cans!! Just want to be sure of the terminology.
I make (pepper) jellies, chutneys and the occasional jam - my laboratory specialists said "2 yrs minimum" - so I put 18 months on the expiry dates.
That might be selfish so that I can sell more...
I've had Apple Chutnies at home which were opened after 3 years. OH!! Wonderful fermented stuff - but I'd keep to the 18-24 month rule.